Automatic valve-controlling device.



N. NELSON.-

AUTOMATIC VALVE CONTROLLING DEVICE.

APPLICATION FILED JUNE 7. 1917.

1,262,689. Patented A r. 16, 1918.

INYENTOR A/e/s Ne/son.

UNETD STAT PAEN @Fl NELS NELSON, OF KINGOOME RIVER, BRITISH COLUMBIA, CANADA.

AUTOMATIC VALVE-CONTROLLING DEVICE.

To all whom it may concern:

Be it known that I, Nuns NnLsoN, a subject of the King of Great Britain, residing at Kingcome River, in the Province of British Columbia, Canada, have invented certain new and useful Improvements in Automatic Valve-Controlling Devices, of, which the following is a specification.

My invention relates to improvements in automatic cut-off devices, and the object of my invention is to provide a device for use with air pumps and the like for the auto matic regulation of the air pressure created by the pump and which device is simple, practical and of a highly efficient character.

I attain this object by the construction illustrated in accompanying drawings in which Figure 1 is a view illustrating; the practical application of my device to an air pump cylinder head. I

Fig. 2 is a plan view of Fig. 1.

Fig. 3 is an end view of Fig. 1.

Similar figures of reference indicate similar parts throughout the several views.

1 indicates a typical air pump cylinder head in which are mounted the suction valve 2 and the discharge valve 3, the valve 3 opening to the discharge pipe 4, on which pipe are arranged T-connections 5 and 6 and in which connections are mounted respectively the air pressure gage 7 and safety valve 8, the pipe or nipple 9 which carries the gage 7 being provided with a T-connection 10.

Secured into the head 1 on each side of the stem 11 of the valve 2 are studs 12 and 13, on the upper ends of which are rigidly supported two plates 14 and 15, these plates being spaced apart by distance pieces 16, as shown more particularly in Fig. 3, and through the lower plate 14 the upper end of the stem 11 slidably extends. Movably mounted on the hood 17 which incloses the stem of the discharge valve 3 is a bell crank lever 18, the long arm of which extends between the plates 14 and 15 and normally to one side of the stem 11, while to the short arm of the lever 18 is connected a lever 19, the free end of which is connected to the end of an elliptical spring tube 20, similar to those found in pressure gages, the other end of which tube is provided with a threaded tubular connection 21 by means of which it, the spring tube, is connected to the T- Specification of Letters Patent.

Application filed June 7, 1917. Serial Ho. 173,357.

' the short bar 24 which connects the lever 19 and tube 20 together, it, the bar, may be moved along the lever 19 ineither direction to regulate the tension of the tube.

The manner in which the device operates may be briefly described as follows :The

pump being in operation and the pressure rising in the pipe 4 and acting on the elliptical tube 20 through pipe 9 and connection 21, the tube will tend to straighten out, thus drawing over the lever 19 to move the bell crank 18 until when the maximum pressure is reached its long arm is horizontal and positioned directly over and bearing on the end of stem 11 of the suction valve, holding it down so that it cannot completely close, thereby allowing the air in the cylinder to escape back through the suction valve seat and thus prevent the air pressure from rising above the required amount. On the pressure falling, the spring tube 20 and the lever 19 return to their normal positions, the long arm of the bell crank 18 being thereby swung clear of the stem 11, allowing the valve 2 to resume its normal operation.

What I claim as my invention is 1. The combination with the suction valve of an air pump, of a laterally movable lever disposed to one side and normally clear of the stem of said valve, and means for moving said lever laterally to a position above the end of said stem when a maximum air pressure is reached so as to prevent seating of the said valve.

2. The combination with the suction valve of an air pump, of a laterally movable lever disposed normally clear of the stem of said valve, and pressure operated means for moving said lever laterally to a position above the end of said stem when a maximum pressure is reached so as to prevent seating of the said valve.

3. The combination with the suction valve of an air pump, of a suitably fulcrumed lever having its long arm arranged adjacent and normally clear of the stem of said valve, a lever connected at one end to the short arm of the fulcrumed lever, and a curved tubular connection between the free 1.10

curved tubular connection between the free,

end of the second mentioned lever and the air discharge pipe, said tubular connection being adjustably secured to the said lever. V

5. The combination With the suction valve of an air pump, of a suitably fulcrumed lever having its long arm arranged adjacent and normally clear of the stem of said valve, a lever connected at one end to the short arm of the fulcrumed lever, and an elliptical tube connected at one end to the air discharge pipe bent round and connected eeaeee at its other end to the free end of the second mentioned lever.

' 6. The combination With the suction valve of an air pump, of a pair of suitably supported superposed plates through the lower 01"- which the end of the suction valve stem normally extends, a suitably fulcrumed lever having its long: arm extending between said plates and normally to one side of the said 7 stem, a second lever connected at one end to the short arm of the fulcrumed lever and extending across the upper plate, and an elliptical tube connected at one end to the air discharge pipe bent round and adjustably connected at its other end to the said second lever.

Dated at Kingcome Inlet, B. 0., this 21st day of May, 1917. V

N ELS NELSON.

Gog pies oi this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

